package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;

    /**
     * 新增菜品, 同时保存对应的口味数据
     * @param dishDto
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDto dishDto) {
        // 保存菜品的基本信息到菜品表dish
        this.save(dishDto);

        // 获取菜品id
        Long dishId = dishDto.getId();

        // 菜品口味
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map( (item) -> {
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());

        // 保存菜品的口味数据到菜品口味表dish_flavor
        dishFlavorService.saveBatch(flavors);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @Override
    public DishDto getByIdWithFlavor(Long id) {
        // 查询菜品基本信息, 从dish表查询
        Dish dish = this.getById(id);

        // 查询当前菜品对应的口味信息, 从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId, id);
        List<DishFlavor> dishFlavors = dishFlavorService.list(queryWrapper);

        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish, dishDto);
        dishDto.setFlavors(dishFlavors);
        return dishDto;
    }

    /**
     * 更新菜品信息, 同时更新对应的口味信息
     * @param dishDto
     */
    @Override
    @Transactional
    public void upateWithFlavor(DishDto dishDto) {
        // 更新dish表
        this.updateById(dishDto);

        // 清理当前菜品对应的口味数据
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId, dishDto.getId());
        dishFlavorService.remove(queryWrapper);

        // 添加当前提交过来的口味数据
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map( (item) -> {
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());
        dishFlavorService.saveBatch(flavors);
    }

    /**
     * 删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void removeWithFlavor(List<Long> ids) {
        // 检查菜品售卖状态
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.in(Dish::getId, ids);
        dishLambdaQueryWrapper.eq(Dish::getStatus, 1);
        int count = this.count(dishLambdaQueryWrapper);
        if(count > 0){
            throw new CustomException("菜品正在售卖中, 不能删除");
        }
        this.removeByIds(ids);

        LambdaQueryWrapper<DishFlavor> dishFlavorLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishFlavorLambdaQueryWrapper.in(DishFlavor::getDishId, ids);
        dishFlavorService.remove(dishFlavorLambdaQueryWrapper);
    }
}
